TWI509344B - Illumination system and projection apparatus - Google Patents

Illumination system and projection apparatus Download PDF

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Publication number
TWI509344B
TWI509344B TW102133964A TW102133964A TWI509344B TW I509344 B TWI509344 B TW I509344B TW 102133964 A TW102133964 A TW 102133964A TW 102133964 A TW102133964 A TW 102133964A TW I509344 B TWI509344 B TW I509344B
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TW
Taiwan
Prior art keywords
laser
light
expanding
wavelength conversion
illumination
Prior art date
Application number
TW102133964A
Other languages
Chinese (zh)
Other versions
TW201512762A (en
Inventor
Chi Tang Hsieh
Chia Hao Wang
Ko Shun Chen
Chi Hsun Wang
Original Assignee
Coretronic Corp
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Priority to TW102133964A priority Critical patent/TWI509344B/en
Publication of TW201512762A publication Critical patent/TW201512762A/en
Application granted granted Critical
Publication of TWI509344B publication Critical patent/TWI509344B/en

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Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/14Details
    • G03B21/20Lamp housings
    • G03B21/206Control of light source other than position or intensity
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/14Details
    • G03B21/20Lamp housings
    • G03B21/2006Lamp housings characterised by the light source
    • G03B21/2033LED or laser light sources
    • G03B21/204LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00Refractors for light sources
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0927Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938Using specific optical elements
    • G02B27/095Refractive optical elements
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10Beam splitting or combining systems
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/001Axicons, waxicons, reflaxicons
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/12Picture reproducers
    • H04N9/31Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141Constructional details thereof
    • H04N9/315Modulator illumination systems
    • H04N9/3158Modulator illumination systems for controlling the spectrum
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/12Picture reproducers
    • H04N9/31Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141Constructional details thereof
    • H04N9/315Modulator illumination systems
    • H04N9/3161Modulator illumination systems using laser light sources

Description

Lighting system and projection device
The present invention relates to an optical system and a display device, and more particularly to an illumination system and a projection device.
In recent years, projection devices mainly based on solid-state light sources such as light-emitting diodes (LEDs) and laser diodes have gradually gained a place in the market. Since the laser diode has a luminous efficiency higher than about 20%, in order to break the light source limitation of the light-emitting diode, a pure color light source for generating a projector by exciting the fluorescent powder with a laser light source has been gradually developed. In addition, the laser projection device can use the laser light source to excite the fluorescent powder, and can directly use the laser light as the projector illumination source, and has the advantage of adjusting the number of the light source according to the brightness requirement, so as to achieve projection of various brightnesses. Machine requirements. Therefore, the projector architecture of a light source system using a laser source has a great potential to replace the traditional high-pressure mercury lamp and become the light source of a new generation of mainstream projectors.
In general, a laser projector must use multiple laser arrays and focus it on the phosphor layer to produce sufficient output intensity. However, with the laser The projector's output brightness requirements are increasing, and the input laser power must be increased. Further, as the input laser power increases, the excessive concentration of laser energy will cause the laser conversion efficiency to decrease. As a result, the laser energy converted to thermal energy on the phosphor layer will increase, which in turn causes an increase in the temperature of the phosphor layer and may affect the luminous efficiency of the phosphor.
In general, a laser projector can achieve a uniformity of energy by disposing a diffusion sheet on a path of a laser beam transmitted from a laser source to a fluorescent wheel to spread the laser spot. However, the diffusion sheet itself causes energy loss. Furthermore, since the divergence angle has a sharp axis (i.e., the long axis of the laser beam) and a slow axis (i.e., the short axis of the laser beam) when the laser beam exits from the light emitting face of the laser source. In other words, the light beam emitted from the light emitting surface of the laser source forms an elliptical cone shape, so that when the laser beam is coupled to the fluorescent wheel, the laser spot formed on the fluorescent wheel is also elliptical. However, since the diffusion direction of the diffusion sheet is isotropic, it may cause the long axis of the laser spot formed on the fluorescent wheel to be too long, which causes difficulty in optical coupling and also generates energy utilization. Loss in efficiency.
An illumination system including a point source array, a collimating lens, and a lens is disclosed in the Republic of China Patent No. I300834. A projection apparatus including a light source, a light valve, a light homogenizing element, and a lens module is disclosed in the Republic of China Patent Publication No. 201215987. U.S. Patent No. 8,109,638 discloses a projector including a light source, a modulation zone, and a projection lens.
The invention provides an illumination system with good illumination spectrum and reliability.
The invention provides a projection device with good image quality and reliability.
Other objects and advantages of the present invention will become apparent from the technical features disclosed herein.
In order to achieve one or a portion or all of the above or other objects, an embodiment of the present invention provides an illumination system. The illumination system includes at least one laser source, at least one non-isotropic light-expanding element, and a wavelength conversion element. At least one laser source emits a laser beam. At least one non-isotropic light-expanding element is located on the transmission path of the laser beam, and the laser beam is spread in a light-expanding direction. The direction of light expansion is substantially parallel to the slow axis of the laser beam. The wavelength conversion element is located on the transmission path of the laser beam.
An embodiment of the invention provides a projection apparatus. The projection device includes a lighting system, a light valve, and a projection lens. The wavelength conversion element includes at least one wavelength conversion region and at least one light transmission region. The at least one wavelength conversion region and the at least one light transmission region are adapted to move to alternately cut into the transmission path of the laser beam. When at least one light penetrating region is cut into the transmission path of the laser beam, the laser beam penetrates the wavelength conversion element, and when at least one wavelength conversion region is cut into the transmission path of the laser beam, the laser beam is converted by at least one wavelength The zone is converted to at least one converted beam. The light valve is disposed on the transmission path of the laser beam and the converted beam to convert the laser beam and the converted beam into an image beam. The projection lens is disposed on the transmission path of the image beam.
In an embodiment of the invention, the anisotropic light-expanding element has an optical axis and a bending surface, and the bending surface includes a plurality of adjacent sub-planes, and at least some of the sub-planes are along the light-expanding The directions are arranged, and the inclination angles of the sub-planes with respect to the optical axis are different.
In an embodiment of the invention, after the laser beam passes through the at least one non-isotropic light-expanding element, it first converges in the light-expanding direction and then expands.
In an embodiment of the invention, the junction of at least two of the sub-planes is a ridgeline, and the fast axis of the laser beam is substantially parallel to the ridgeline.
In an embodiment of the invention, the anisotropic light-expanding element is a wedge-shaped element, and the adjacent sub-planes are arranged along a first direction, and the fast axis of the laser beam is substantially parallel to the first direction. .
In an embodiment of the invention, the adjacent two sub-planes form a recess.
In an embodiment of the invention, the adjacent two sub-planes form a convex surface.
In an embodiment of the invention, each of the adjacent two sub-planes forms a convex surface, and a plurality of concave portions exist between the convex surfaces.
In an embodiment of the invention, the adjacent sub-planes are arranged around the optical axis such that the curved surface forms a tapered surface.
In an embodiment of the invention, the wavelength conversion component includes at least one wavelength conversion region and at least one light transmission region, and the at least one wavelength conversion region and the at least one light transmission region are adapted to move to cut into the laser beam in turn. On the path of transmission, when When a light-transmitting region cuts into the transmission path of the laser beam, the laser beam penetrates the wavelength conversion element, and when at least one wavelength conversion region is cut into the transmission path of the laser beam, the laser beam is at least one wavelength conversion region. Converted to at least one converted beam. The illumination system further includes a light combining unit between the at least one laser light source and the wavelength conversion element and located in the transmission path of the at least one converted beam and the laser beam penetrating the wavelength conversion element.
In an embodiment of the invention, the wavelength conversion component is located on a transmission path of the laser beam between the at least one laser light source and the non-isotropic light-expanding element, and the at least one light-transmitting region is cut into the laser beam. Upon passing through the path, the laser beam passes through the wavelength conversion element and is transmitted to the anisotropic light-emitting element and to the light combining unit via the non-isotropic light-emitting element.
In an embodiment of the invention, the anisotropic light-expanding element is located between the at least one laser light source and the wavelength conversion element, and the laser beam is transmitted to the wavelength conversion element via the non-isotropic light-emitting element.
In an embodiment of the invention, the at least one non-isotropic light-expanding element is a two-isotropic light-diffusing element, and one of the two non-isotropic light-emitting elements is located between the at least one laser light source and the wavelength conversion element. The wavelength conversion element is located on a transmission path of the laser beam between the at least one of the laser light source and the other of the two non-isotropic light-emitting elements.
In an embodiment of the invention, the anisotropic light-expanding element comprises a plurality of lenticular lenses, wherein the lenticular lenses are arranged along a light-expanding direction and extend along a first direction, and the fast axis of the laser beam It is substantially parallel to the first direction.
In an embodiment of the invention, the non-isotropic light-expanding component is a non- Isotropic diffuser.
Based on the above, embodiments of the present invention can achieve at least one of the following advantages or effects. The illumination system and projection apparatus of the embodiment of the present invention expands light in the direction of the slow axis by the non-isotropic light-expanding element. As a result, the laser spot can be anisotropically adjusted and the energy concentration can be reduced, and the optical coupling loss that may be caused when the laser beam is coupled to the wavelength conversion element is avoided. In the illumination system and the projection apparatus of the embodiment of the present invention, the non-isotropic light-expanding element is used to expand the laser beam in the direction of the slow axis, so that the laser spot can be adjusted to be anisotropic. To improve illumination uniformity and image uniformity.
The above described features and advantages of the invention will be apparent from the following description.
60‧‧‧Laser beam
70‧‧‧Converting beam
80‧‧‧Image beam
100, 1300, 1400, 1500‧‧‧ lighting systems
110‧‧‧Laser light source
120, 720, 820, 920, 1020, 1120a, 1120b, 1120, 1220‧‧‧ non-isotropic diffusing elements
121‧‧‧Bend surface
130‧‧‧wavelength conversion components
131‧‧‧wavelength conversion zone
133‧‧‧Light penetration zone
141, 143, 145‧ ‧ lens
150‧‧‧Hybrid unit
160‧‧‧Light Transfer Module
170‧‧‧Light homogenizing components
200‧‧‧Projection device
210‧‧‧Light valve
220‧‧‧Projection lens
O‧‧‧ optical axis
D1‧‧‧ first direction
E1‧‧‧Lighting direction
SS‧‧‧ subplane
PS‧‧‧ raised surface
GP‧‧‧Depression
IP‧‧‧Slope platform
P‧‧‧ Platform Department
LL‧‧‧ lenticular lens
RL‧‧‧ ridgeline
x, y, z‧‧ direction
Θ‧‧‧ angle
A‧‧‧Magnification area
FIG. 1A is a schematic structural diagram of a projection apparatus according to an embodiment of the invention.
Fig. 1B is an enlarged partial view showing a partial distribution of a beam of the laser beam in the vicinity of the color wheel of Fig. 1A.
2A is a front elevational view of an anisotropic light-expanding element of FIG. 1A.
2B is a schematic cross-sectional view of the anisotropic light-expanding element of FIG. 2A.
3 is a schematic view of the optical path of the anisotropic light-expanding element of FIG. 2A.
4A and 4B are beam distribution diagrams of a laser beam after passing through an anisotropic light-expanding element.
5A and 5B are beam distribution diagrams when the laser beam is not an anisotropic light-expanding element.
Figure 6 is a front elevational view of the wavelength conversion element of Figure 1A.
7A, 8A, 9A and 10A are schematic elevational views showing variations of the different anisotropic light-expanding elements of FIG. 1A.
7B, 8B, 9B, and 10B are schematic cross-sectional views of the anisotropic light-expanding element of Figs. 7A, 8A, 9A, and 10A, respectively.
11A-11C are front elevational views of the different anisotropic light-expanding elements of FIG. 1A.
Figure 12 is a perspective view of another anisotropic light-expanding element of Figure 1A.
FIG. 13 is a schematic structural diagram of a projection apparatus according to another embodiment of the present invention.
FIG. 14 is a schematic structural diagram of a projection apparatus according to still another embodiment of the present invention.
FIG. 15 is a schematic structural diagram of a projection apparatus according to still another embodiment of the present invention.
The foregoing and other objects, features, and advantages of the present invention will be apparent from the Detailed Description The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.
FIG. 1A is a schematic structural diagram of a projection apparatus according to an embodiment of the invention. Figure 1B is a partial enlargement of the beam distribution of the laser beam in the vicinity of the color wheel of Figure 1A schematic diagram. Referring to FIG. 1A , the projection apparatus 200 includes an illumination system 100 , a light valve 210 , and a projection lens 220 . In the present embodiment, the light valve 210 is, for example, a digital micro-mirror device (DMD) or a liquid-crystal-on-silicon panel (LCOS panel). However, in other embodiments, the light valve 210 can also be a transmissive liquid crystal panel or other spatial light modulator.
Specifically, in the present embodiment, the illumination system 100 includes at least one laser light source 110, at least one non-isotropic light-expanding element 120, and a wavelength conversion element 130. For example, the laser light source 110 can be, for example, a blue laser diode bank, the laser beam 60 is a blue laser beam, and the wavelength conversion element 130 is a wavelength conversion wheel, but the present invention Not limited to this. On the other hand, in the present embodiment, the anisotropic light-expanding element 120 is located on the transmission path of the laser beam 60 and is located between the at least one laser source 110 and the wavelength conversion element 130. In more detail, in the embodiment, the illumination system 100 further includes a plurality of lenses 141, 143, 145 between the laser source 110 and the wavelength conversion element 130, and the non-isotropic expansion element 120 is located at the lens 143. Between the lenses 145, the laser beam 60 can be transmitted to the wavelength conversion element 130 via the anisotropic light-emitting element 120.
Further, in the present embodiment, the laser source 110 emits a laser beam 60. In general, when the laser beam exits the illuminating surface of the laser source 110, the divergence angle has a fast axis (i.e., the long axis of the laser beam 60) and a slow axis (i.e., the short axis of the laser beam 60). do not. In other words, the light beam emitted from the light emitting surface of the laser light source 110 forms an elliptical cone, and the non-isotropic light diffusing element 120 causes the laser beam 60 to expand in the light expanding direction E1. In addition, in this embodiment, as shown in the enlarged area of FIG. 1B As shown in the field A, in an embodiment, after the laser beam 60 passes through the non-isotropic light-expanding element 120, after passing through the lens 145, the laser beam 60 first converges/converges in the light-expanding direction E1 and then expands/diverges. In this embodiment, the non-isotropic light-expanding element 120 is provided. The laser beam 60 can be focused on the side of the wavelength conversion element 130 that receives the laser beam 60, and the light is diverged to reduce the energy of the laser beam 60. Concentration and increasing the contact reaction area of the laser beam 60 with the wavelength conversion element 130 improve the wavelength conversion efficiency of the laser beam 60.
In the present embodiment, the light-expanding direction E1 is substantially parallel to the slow axis of the laser beam 60. The slow axis of the laser beam 60 is, for example, the x direction, and the fast axis of the laser beam 60 is, for example, the y direction. In this way, the shaping effect of the spot generated by the laser beam 60 incident on the wavelength conversion element 130 can be achieved, and even if the beam changes from an elliptical cone to a relatively conical shape, it is possible to avoid the possibility that the laser beam is coupled to the wavelength conversion element 130. The resulting loss in optical coupling. The structure and efficiency of the non-isotropic light-emitting element 120 will be further described below with reference to FIGS. 2A to 5B.
2A is a front elevational view of an anisotropic light-expanding element of FIG. 1A. 2B is a schematic cross-sectional view of the anisotropic light-expanding element of FIG. 2A. Referring to FIG. 2A and FIG. 2B, in the embodiment, the anisotropic light-expanding element 120 has an optical axis O and a bending surface 121. The bending surface 121 includes a plurality of adjacent sub-planes SS, at least a portion. These sub-planes SS are arranged along the light-expanding direction E1, and the inclination angles of these sub-planes SS with respect to the optical axis O are different. In the present embodiment, the light expansion direction E1 is, for example, the x direction. In more detail, in the present embodiment, the anisotropic light-expanding element 120 is a wedge-shaped element. The adjacent sub-planes SS extend along a first direction D1 and the laser The fast axis of beam 60 is substantially parallel to first direction D1. In the present embodiment, the first direction D1 is, for example, the y direction.
Further, as shown in FIG. 2B, in the present embodiment, the adjacent two sub-planes SS having different inclination angles with respect to the optical axis O may form a convex surface PS. In addition, in the present embodiment, the boundary between two adjacent ones of the adjacent sub-planes SS is a ridge line RL, and the extending direction of the ridge line RL is the first direction D1. In other words, the fast axis of the laser beam 60 is substantially parallel to the ridgeline RL.
3 is a schematic view of the optical path of the anisotropic light-expanding element of FIG. 2A. 4A and 4B are beam distribution diagrams of a laser beam after passing through an anisotropic light-expanding element. 5A and 5B are beam distribution diagrams when the laser beam is not an anisotropic light-expanding element. As shown in FIG. 3, when the laser beam 60 passes through the anisotropic light-diffusing element 120, since the tilt angle of the sub-plane SS of the non-isotropic light-expanding element 120 with respect to the optical axis O is different, the non-isotropic light is expanded. The direction in which the laser beam 60 of the sub-plane SS portion of the element 120 is deflected is also different, thereby achieving the effect of spot adjustment. Further, as shown in FIG. 4A and FIG. 4B, since in the present embodiment, the sub-planes SS are arranged along the light-expanding direction E1 (ie, the x-direction), the non-isotropic light-expanding element 120 is mainly for the lightning. The component of the beam 60 in the x direction is deflected, while the component in the y direction is not. Comparing the results of FIGS. 4A and 4B with the results of FIGS. 5A and 5B, it can be seen that after the laser beam 60 passes through the non-isotropic light-expanding element 120, it can be aimed at the slow axis (ie, the x-direction). The laser spot is diffused and the laser spot is maintained at its original size on the fast axis (ie, the y-direction). Further, if the peak of the energy distribution of the laser beam 60 in the embodiment of FIGS. 5A and 5B is 100%, the laser beam 60 in the embodiment of FIGS. 4A and 4B. The peak energy distribution is 53%. Therefore, the non-isotropic light-expanding element 120 can achieve an anisotropic adjustment of the laser spot and reduce the energy concentration, thereby preventing the subsequent laser beam from being coupled to the wavelength conversion element 130, which may result in The optical coupling loss and also because of the anisotropic expansion of the spot can reduce the problem of accumulated heat of the fluorescent wheel.
Next, referring to FIG. 1A again, in the embodiment, the illumination system 100 further includes a light combining unit 150 located between the at least one laser light source 110 and the wavelength conversion component 130 and located at the thunder of the wavelength conversion component 130. The path of the beam 60 is transmitted. Specifically, the light combining unit 150 is a dichroic mirror or a color separation pupil, and can provide different optical effects on light beams of different colors. For example, in the present embodiment, the light combining unit 150 can, for example, allow the blue light beam to penetrate while providing a reflection effect on the light beams of other colors (such as red, green, yellow, etc.). That is to say, in the present embodiment, the light combining unit 150 can penetrate the laser beam 60, and thus, the laser beam 60 can penetrate the light combining unit 150 and be incident on the wavelength conversion element 130.
FIG. 6 is a front elevational view of the wavelength conversion element 130 of FIG. 1A. On the other hand, as shown in FIG. 1A, the wavelength conversion element 130 is located on the transmission path of the laser beam 60, and the illumination system 100 further includes a light homogenizing element 170 located on the transmission path of the laser beam 60. In more detail, as shown in FIG. 6, in the present embodiment, the wavelength conversion element 130 includes at least one wavelength conversion region 131a, 131b and at least one light transmission region 133. For example, in the embodiment, the wavelength conversion regions 131a and 131b further include a phosphor layer (not shown) of the phosphor layer, wherein the phosphor layers included in the wavelength conversion regions 131a and 131b are The laser beam 60 is different in color. For example, The color of the phosphor layer included in the wavelength conversion regions 131a and 131b may be, for example, red and green, respectively. The at least one wavelength conversion region 131a, 131b and the at least one light penetrating region 133 are adapted to move to alternately cut into the transmission path of the laser beam 60.
When at least one of the wavelength conversion regions 131a, 131b is alternately cut into the transmission path of the laser beam 60, the laser beam 60 is converted into at least one converted beam 70 of red or green by at least one of the wavelength conversion regions 131a, 131b, and at least one The converted beam 70 can then be reflected by the wavelength conversion element 130. On the other hand, as shown in FIG. 1A, the light combining unit 150 is located on the transmission path of the at least one converted light beam 70, so that at least one converted light beam 70 is transmitted to the light combining unit 150.
When at least one light penetrating region 133 is cut into the transmission path of the laser beam 60, the laser beam 60 penetrates the wavelength conversion element 130, is transmitted to the light combining unit 150 via a light transmission module 160, and penetrates the light. Unit 150 is passed to light homogenizing element 170. Furthermore, the colors of the at least one converted beam 70 and the laser beam 60 are different from each other, and thus transferred to the light combining unit 150 will be reflected to the light homogenizing element 170. In this way, when the at least one wavelength conversion region 131a, 131b and the at least one light transmission region 133 are cut into the transmission path of the laser beam, the laser beam 60 irradiated on the wavelength conversion element 130 can be sequentially converted into A plurality of different colors are delivered to the light homogenizing element 170.
It should be noted that, in the embodiment, the light combining unit 150 is a dichroic mirror or a color separation mirror that allows a blue light beam to penetrate and provides a reflection effect on light beams of other colors (such as red, green, etc.). As an example, the invention is not limited thereto. In other embodiments, the light combining unit 150 is also capable of providing a reflection to the blue light beam. A dichroic mirror or a color separation that allows beams of other colors (such as red, green, etc.) to pass through. A person skilled in the art can use the appropriate optical path design for the laser beam 60 and the converted beam 70 according to actual needs, and the light combining unit 150 can also achieve a similar light combining effect, and will not be described herein. .
In addition, as shown in FIG. 1A, when the laser beam 60 and the converted beam 70 are transmitted to the light homogenizing element 170 via the illumination system 100, the light homogenizing element 170 can uniformize the laser beam 60 and the converted beam 70 of these different colors. And pass it to the light valve 210. The light valve 210 is disposed on the transmission path of the laser beam 60 and the converted beam 70 to convert the laser beam 60 and the converted beam 70 into an image beam 80. The projection lens 220 is disposed on the transmission path of the image beam 80 and is used to project the image beam 80 onto a screen to form an image frame. Since the laser beams 60 and the converted light beams 70 of different colors converge on the light valve 210, the light valve 210 sequentially converts the laser beams 60 and the converted light beams 70 of different colors into image beams 80 of different colors and transmits them to the projection lens. 220, therefore, the image frame projected by the image beam 80 converted by the light valve 210 can be a color picture.
In addition, it should be noted that the asymmetrical light-expanding element 120 of the present embodiment is exemplified by a wedge-shaped element having a convex surface PS, but the invention is not limited thereto. In other embodiments, the anisotropic light-emitting elements 120 will have different structural designs, which will be further explained below in conjunction with FIGS. 7A-10B.
7A, 8A, 9A, and 10A are schematic elevational views showing variations of the different anisotropic light-emitting elements 120 of FIG. 1A. 7B, 8B, 9B, and 10B are the anisotropic light-expanding elements 120 of FIGS. 7A, 8A, 9A, and 10A, respectively. Schematic diagram of the section. Referring to FIGS. 7A through 10B, the non-isotropic light-expanding elements 720, 820, 920, and 1020 are similar to the anisotropic light-emitting element 120 of FIG. 2A, and the differences are as follows. In the embodiment of FIG. 7A and FIG. 7B, the adjacent two sub-planes SS of the non-isotropic light-expanding element 720 form a recess GP, and in the embodiment of FIGS. 8A and 8B, the non-isotropic light-emitting element 820 The adjacent two sub-planes SS form a sloped platform having a platform P and a slope IP. In the embodiment of FIG. 9A and FIG. 9B and FIG. 10A and FIG. 10B, adjacent two sub-planes SS of the non-isotropic light-expanding elements 920, 1020 form a convex surface PS, and at least between the convex surfaces PS A recess GP. In these embodiments, as the laser beam 60 passes through the anisotropic light-expanding element 120, the laser beam 60 passing through the inclined portions of the non-isotropic diffusing elements 720, 820, 920, 1020 will still be deflected, passing The beam of the platform portion P maintains the original direction. In this way, the non-isotropic light-expanding elements 720, 820, 920, and 1020 can also achieve the effect of spot adjustment, and have similar functions and advantages as the non-isotropic light-emitting elements 120, and will not be described herein.
11A-11C are schematic front views of different anisotropic light-expanding elements 120 of FIG. 1A. Referring to FIGS. 11A through 11C, the non-isotropic light-expanding elements 1120a, 1120b, and 1120c are similar to the non-isotropic light-emitting element 120 of FIG. 2A, and the differences are as follows. In the embodiment of Figs. 11A to 11C, the adjacent sub-planes SS of the non-isotropic light-expanding elements 1120a, 1120b, 1120c are arranged around the optical axis O such that the curved surface 121 forms a tapered surface. For example, (as shown in FIGS. 11A-11C), the curved surface 121 can be a triangular pyramidal surface (as shown in FIG. 11A), a quadrangular pyramidal surface (as shown in FIG. 11B), or a pentagon cone. Shaped surface (as shown in Fig. 11C), but the invention is not limited thereto. In these embodiments, when the laser beam 60 passes through the anisotropic diffusing element At 1120a, 1120b or 1120c, the laser beam 60 passing through the portion of the curved surface 1121a, 1121b or 1121c of the non-isotropic diffusing element 1120a, 1120b or 1120c will still be deflected, thus unequal The effect of spot adjustment can also be achieved toward the light-diffusing elements 1120a, 1120b or 1120c.
For example, as shown in FIG. 11A, in the present embodiment, the fast axis of the laser beam 60 can be substantially between the ridges RL of the adjacent sub-planes SS. As such, when the laser beam 60 passes through the anisotropic light-diffusing element 1120a having a triangular pyramidal surface, for example, the laser beam 60 passing through the upper left portion of FIG. 11A through the non-isotropic light-expanding element 1120a will be to the right. With the lower deflection, the laser beam 60 passing through the upper right portion of FIG. 11A through the non-isotropic light-expanding element 1120a will be deflected to the lower left, and the laser beam 60 passing through the lower portion of the non-isotropic light-expanding element 1120a in FIG. After being deflected upward, and after the laser beam 60 passes through the non-isotropic light-expanding element 1120a, it will first converge in the light-expanding direction E1 and then expand, thereby achieving the effect of spot adjustment.
On the other hand, in the embodiment of Fig. 11B, the slow axis of the laser beam 60 can be substantially between the ridges RL of the adjacent sub-planes SS, and the ridges RL of the sub-planes SS that meet these The angle is 45 degrees. In other words, in the embodiment of Fig. 11B, the angle θ between the light-expanding direction E1 and the ridge line RL of the adjacent sub-planes SS is also 45 degrees. As a result, when the laser beam 60 passes through the anisotropic light-expanding element 1120b, the laser beam 60 passing through the portion of the curved surface 121 of the non-isotropic light-expanding element 120 is also deflected, and is in the direction of light expansion. E1 first converges and then expands, which can achieve the effect of spot adjustment. Similarly, in the embodiment of Figure 11C, the fast axis of the laser beam 60 can be substantially between the ridges RL of the adjacent sub-planes SS. between. When the laser beam 60 passes through the anisotropic light-diffusing element 1120c having a pentagonal tapered surface, it also converges in the light-expanding direction E1 and then spreads out. Therefore, the non-isotropic light-expanding element 1120c also has the effect of spot adjustment.
Figure 12 is a perspective view of another anisotropic light-expanding element of Figure 1A. Referring to FIG. 12, the non-isotropic light-expanding element 1220 is similar to the anisotropic light-emitting element 120 of FIG. 2A, and the differences are as follows. In the present embodiment, the anisotropic light-drenging element 1220 includes a plurality of lenticular lenses LL, wherein the lenticular lenses LL are arranged along the light-expanding direction E1 and extend along the first direction D1, and the fast axis of the laser beam 60 It is substantially parallel to the first direction D1. As such, when the laser beam 60 passes through the pair of non-isotropic light-expanding elements 1220, the lenticular lens LL can also deflect the laser beam 60, and since in the present embodiment, these sub-planes SS The light-expanding direction E1 (i.e., the x-direction) is arranged. Therefore, the non-isotropic light-expanding element 1220 mainly deflects the component of the laser beam 60 in the x direction, but does not. Thus, the non-isotropic light-expanding element 1220 can also achieve the effect of spot adjustment, and has similar functions and advantages as the non-isotropic light-emitting element 120, and will not be described herein.
In addition, in another embodiment not shown, the non-isotropic diffusing element may also be an anisotropic diffusing sheet having a plurality of optical microstructures thereon, and the manner of forming the micro structures is, for example, The convex surface PS, the depressed portion GP, the tapered surface, or the lenticular lens LL structure of the anisotropic light-emitting element 120 is formed by miniaturization. Therefore, the anisotropic diffusion sheet can also achieve the effect of spot adjustment, and has similar functions and advantages as the non-isotropic light-expanding element 120, and will not be described herein.
In view of the above, due to the non-isotropic diffusing elements 720, 820, 920, 1020, 1120a, 1120b, 1120, 1220 and non-isotropic diffusion sheets can achieve the effect of spot adjustment, and therefore can also be applied to the projection device 200 of FIG. 1A, so that the projection device 200 can still achieve similar functions and advantages. It will not be repeated here.
FIG. 13 is a schematic structural diagram of a projection apparatus according to another embodiment of the present invention. Referring to Figure 13, the illumination system 1300 of the present embodiment is similar to the illumination system 100 of Figure 1A, with the differences described below. In the present embodiment, the anisotropic light-expanding element 120 is located between the lens 141 and the lens 143. Since the non-isotropic light-emitting element 120 can still transmit the laser beam 60 to the wavelength conversion element 130 via the anisotropic light-emitting element 120 and achieve the effect of spot adjustment, the projection device 1300 can still achieve similar to the projection device 200. Efficacy and advantages are not repeated here.
In addition, the anisotropic light-expanding element 120 of the foregoing embodiment is exemplified between the at least one laser light source 110 and the wavelength conversion element 130, but the invention is not limited thereto. In other embodiments, the anisotropic light-expanding element 120 may also be located elsewhere in the projection device 200, which will be further described below in conjunction with FIGS. 14-15.
FIG. 14 is a schematic structural diagram of a projection apparatus according to still another embodiment of the present invention. Referring to Figure 14, the illumination system 1400 of the present embodiment is similar to the illumination system 100 of Figure 1A, with the differences described below. Referring to FIG. 6 and FIG. 14 simultaneously, in the present embodiment, the wavelength conversion element 130 is located on the transmission path of the laser beam 60 between the at least one of the laser light source 110 and the non-isotropic light-emitting element 120. When at least one of the light penetrating regions 133 cuts into the transmission path of the laser beam 60, the laser beam 60 penetrates the wavelength conversion element 130 and is transmitted to the anisotropic light-emitting element 120, and is transmitted via the non-isotropic light-emitting element 120. To the light unit 150. Further, the laser that penetrates the wavelength conversion element 130 The beam 60 also has an anisotropic (ie, an elliptical cone). However, since the converted beam converted by the wavelength converting element has a conical shape, the difference in shape of the light cone of the laser beam and the converted beam may result in the illumination system providing The uniformity of the color of the beam is reduced, which may have an effect on the uniformity of the projected color. However, in the present embodiment, since the laser beam 60 penetrating the wavelength conversion element 130 passes through the anisotropic light-emitting element 120, its light shape will be adjusted and focused in advance, so that when the laser beam 60 is transmitted By the light homogenizing element 170, the color uniformity of the beam provided by the illumination system will not be reduced. In this way, the color uniformity of the projection can be improved.
In addition, it should also be noted that in the embodiment of FIG. 1A, since the anisotropic light-expanding element 120 of the illumination system 100 is located between the laser light source 110 and the wavelength conversion element 130, the light of the laser beam 60 can be made. The tapered shape is adjusted before being transmitted to the wavelength conversion element 130, and is relatively conical, so that it can also have the effect of improving the color uniformity of illumination and projection.
FIG. 15 is a schematic structural diagram of a projection apparatus according to still another embodiment of the present invention. Referring to Figure 15, the illumination system 1500 of the present embodiment is similar to the illumination system 100 of Figure 1A, with the differences described below. Referring to FIG. 15 , in the embodiment, at least one non-isotropic light-expanding element 120 is a two non-isotropic light-emitting element 120 , and one of the two non-isotropic light-emitting elements 120 is located at at least one of the laser light source 110 and the wavelength. Between the conversion elements 130, the wavelength conversion element 130 is located on the transmission path of the laser beam 60 between the at least one of the laser source 110 and the other of the two non-isotropic light-emitting elements 120. In other words, in the present embodiment, the anisotropic light-expanding element 120 located between the at least one laser light source 110 and the wavelength conversion element 130 can transmit the laser beam 60 through the non-isotropic light-emitting element 120. The wavelength conversion element 130 is reached and the effect of spot adjustment is achieved. Furthermore, since the wavelength conversion element 130 is located on the transmission path of the laser beam 60 between the at least one laser light source 110 and the other non-isotropic light-expanding element 120, the color uniformity of the projection can be improved. Therefore, the illumination system 1500 can achieve the similar functions and advantages of the foregoing illumination system 1400 and the illumination system 100, so that the projection device 200 can still achieve similar functions and advantages, and will not be further described herein.
In addition, since the non-isotropic light-expanding elements 720, 820, 920, 1020, 1120a, 1120b, 1120, 1220 and the non-isotropic diffusing sheet can also achieve the effect of spot adjustment, they can also be applied to FIG. 13 to FIG. The lighting system 1300, 1400, 1500 of the 15 and the projection device 200 can still achieve similar functions and advantages, and will not be further described herein.
In summary, the illumination system and the projection apparatus of the embodiment of the present invention have different inclination angles of the sub-planes of the non-isotropic light-expanding elements with respect to the optical axis, and thus can pass through the sub-plane portion of the anisotropic light-expanding element. The laser beam is deflected in different directions, and the laser beam can be diffused in the direction of the slow axis. In this way, the laser spot can be adjusted to be anisotropic, and the energy concentration can be reduced, and the optical coupling loss which may be caused when the laser beam is coupled to the wavelength conversion element is avoided, and the fluorescent wheel can also be reduced. Heat accumulation problem. In addition, the illumination system and the projection apparatus of the embodiments of the present invention may also arrange the wavelength conversion element on the transmission path of the laser beam between the at least one laser light source and the other non-isotropic light-expanding element to improve illumination and The uniformity of the color of the projection.
However, the above is only a preferred embodiment of the present invention, when it is not possible The scope of the present invention is defined by the scope of the invention, and the equivalent equivalents and modifications of the present invention are still within the scope of the present invention. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the invention.
60‧‧‧Laser beam
70‧‧‧Converting beam
80‧‧‧Image beam
100‧‧‧Lighting system
110‧‧‧Laser light source
120‧‧‧A non-isotropic diffusing element
130‧‧‧wavelength conversion components
141, 143, 145‧ ‧ lens
150‧‧‧Hybrid unit
160‧‧‧Light Transfer Module
170‧‧‧Light homogenizing components
200‧‧‧Projection device
210‧‧‧Light valve
220‧‧‧Projection lens
x, y, z‧‧ direction
E1‧‧‧Lighting direction
A‧‧‧Magnification area

Claims (27)

  1. An illumination system comprising: at least one laser light source emitting a laser beam; at least one non-isotropic light-expanding element located on a transmission path of the laser beam, and causing the laser beam to expand in a light-expanding direction And the light expansion direction is substantially parallel to a slow axis of the laser beam; and a wavelength conversion element is located on the transmission path of the laser beam.
  2. The illumination system of claim 1, wherein the laser beam passes through the at least one anisotropic light-expanding element, and the laser beam expands the spot in the light-expanding direction after the convergence spot.
  3. The illumination system of claim 1, wherein the anisotropic light-expanding element has an optical axis and a bending surface, the bending surface comprising a plurality of adjacent sub-planes, at least a portion of the sub-planes The middle is arranged along the light-expanding direction, and the inclination angles of the sub-planes with respect to the optical axis are different.
  4. The illumination system of claim 3, wherein the intersection of at least two of the sub-planes is a ridgeline, and the fast axis of the laser beam is substantially parallel to the ridgeline.
  5. The illumination system of claim 4, wherein the anisotropic light-expanding element is a wedge-shaped element, the adjacent sub-planes extend in a first direction, and the fast axis of the laser beam is substantially Parallel to the first direction.
  6. The illumination system of claim 4, wherein the adjacent two sub-planes form a recess.
  7. The illumination system of claim 4, wherein the adjacent two sub-planes form a convex surface.
  8. The illumination system of claim 4, wherein each of the adjacent sub-planes forms a convex surface, and at least one recess is present between the convex surfaces.
  9. The illumination system of claim 3, wherein the adjacent sub-planes are arranged around the optical axis such that the curved surface forms a tapered surface.
  10. The illumination system of claim 1, wherein the wavelength conversion element comprises at least one wavelength conversion region and at least one light transmission region, the at least one wavelength conversion region and the at least one light transmission region being adapted to move to Rotating into the transmission path of the laser beam, when the at least one light penetrating region cuts into the transmission path of the laser beam, the laser beam penetrates the wavelength conversion element, and when the at least one wavelength conversion region is cut into the The laser beam is converted into the at least one converted light beam by the at least one wavelength conversion region, and the illumination system further includes: a light combining unit located at the at least one laser light source and the wavelength conversion Between the components, and located in the transmission path of the at least one converted beam and the laser beam penetrating the wavelength conversion element.
  11. The illumination system of claim 10, wherein the wavelength conversion element is located on a transmission path of the laser beam between the at least one laser light source and the non-isotropic light-emitting element, when the at least one light is worn. When the through region is cut into the transmission path of the laser beam, the laser beam passes through the wavelength conversion element and is transmitted to the anisotropic light-emitting element, and is transmitted to the light combining unit via the anisotropic light-emitting element.
  12. The illumination system of claim 1, wherein the non-isotropic A light-expanding element is disposed between the at least one laser light source and the wavelength conversion element, and the laser beam is transmitted to the wavelength conversion element via the anisotropic light-emitting element.
  13. The illumination system of claim 1, wherein the at least one non-isotropic light-expanding element is a two non-isotropic light-expanding element, and one of the two non-isotropic light-emitting elements is located at the at least one laser light source. Between the wavelength conversion elements, the wavelength conversion element is located on a transmission path of the laser beam between the at least one laser light source and the other of the two non-isotropic light-emitting elements.
  14. The illumination system of claim 1, wherein the anisotropic light-expanding element comprises a plurality of lenticular lenses, wherein the lenticular lenses are arranged along the light-expanding direction and extend along a first direction, and The fast axis of the laser beam is substantially parallel to the first direction.
  15. The illumination system of claim 1, wherein the anisotropic light-expanding element is an anisotropic diffusion sheet.
  16. A projection apparatus comprising: an illumination system comprising: at least one laser light source emitting a laser beam; at least one non-isotropic light-expanding element located on a transmission path of the laser beam, and causing the laser beam to be Expanding in a light-expanding direction, and the light-expanding direction is substantially parallel to a slow axis of the laser beam; and a wavelength conversion element is disposed on the transmission path of the laser beam, the wavelength conversion element including at least one wavelength conversion a region and at least one light penetrating region, the at least one wavelength converting region and the at least one light penetrating region being adapted to move to take turns Inserting into the transmission path of the laser beam, the at least one light penetrating region cuts into a transmission path of the laser beam, the laser beam penetrates the wavelength conversion element, and the at least one wavelength conversion region cuts into the laser beam The laser beam is converted into at least one converted beam by the at least one wavelength conversion region; a light valve is disposed on the transmission path of the laser beam and the converted beam, and is adapted to the laser beam The converted beam is converted into an image beam; and a projection lens is disposed on the transmission path of the image beam.
  17. The projection device of claim 16, wherein the laser beam passes through the at least one anisotropic light-expanding element, and the laser beam expands the spot in the light-expanding direction after the convergence spot.
  18. The projection device of claim 16, wherein the anisotropic light-expanding element has an optical axis and a bending surface, the bending surface comprising a plurality of adjacent sub-planes, at least part of the sub-planes The middle is arranged along the light-expanding direction, and the inclination angles of the sub-planes with respect to the optical axis are different.
  19. The projection device of claim 18, wherein an intersection of at least two adjacent ones of the sub-planes is a ridge line, and a fast axis of the laser beam is substantially parallel to the ridge line.
  20. The projection device of claim 19, wherein the anisotropic light-expanding element is a wedge-shaped element, the adjacent sub-planes extend in a first direction, and the fast axis of the laser beam is substantially Parallel to the first direction.
  21. The projection device of claim 19, wherein the adjacent two sub-planes form a recess.
  22. The projection device of claim 19, wherein the adjacent two sub-planes form a convex surface.
  23. The projection device of claim 19, wherein each of the adjacent sub-planes forms a convex surface, and at least one concave portion exists between the convex surfaces.
  24. The projection device of claim 18, wherein the adjacent sub-planes are arranged around the optical axis such that the curved surface forms a tapered surface.
  25. The projection device of claim 16, further comprising: a light combining unit located between the at least one laser light source and the wavelength conversion element, and located at the at least one converted light beam and penetrating the wavelength conversion element The laser beam is transmitted over the path.
  26. The projection device of claim 25, wherein the wavelength conversion element is located on a transmission path of the laser beam between the at least one laser light source and the non-isotropic light-emitting element, when the at least one light is worn. When the through region is cut into the transmission path of the laser beam, the laser beam passes through the wavelength conversion element and is transmitted to the anisotropic light-emitting element, and is transmitted to the light combining unit via the anisotropic light-emitting element.
  27. The projection device of claim 16, wherein the non-isotropic light-expanding element is located between the at least one laser light source and the wavelength conversion element, and the laser beam is transmitted to the laser beam via the anisotropic light-emitting element. Wavelength conversion element.
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US9599882B2 (en) 2017-03-21

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